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Keywords = photonic hypercrystals

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28 pages, 8135 KiB  
Communication
Angle-Dispersion-Free Near-Infrared Transparent Bands in One-Dimensional Photonic Hypercrystals
by Feng Wu, Jiayi Ruan, Li He, Abinash Panda and Haitao Jiang
Photonics 2025, 12(8), 748; https://doi.org/10.3390/photonics12080748 - 24 Jul 2025
Viewed by 261
Abstract
In classic all-dielectric one-dimensional photonic crystals, transparent bands exhibit strong angular dispersion. Herein, we realize an angle-dispersion-free near-infrared transparent band in a one-dimensional photonic hypercrystal containing hyperbola-dispersion metamaterials. As the incident angle increases from 0° to 80°, the relative shifts of the wavelengths [...] Read more.
In classic all-dielectric one-dimensional photonic crystals, transparent bands exhibit strong angular dispersion. Herein, we realize an angle-dispersion-free near-infrared transparent band in a one-dimensional photonic hypercrystal containing hyperbola-dispersion metamaterials. As the incident angle increases from 0° to 80°, the relative shifts of the wavelengths of four transmittance peaks within the transparent band are smaller than 1.5% and the bandwidth of the transparent band marginally fluctuates from 1098.2 to 1132.5 nm. Particularly, the angle-dispersion-free property of the transparent band is quite robust with respect to the layer thickness disturbance. Our work not only offers a viable method of achieving angle-dispersion-free transparent bands but also facilitates the development of transparency-based optical devices. Full article
(This article belongs to the Special Issue Photonic Crystals: Physics and Devices, 2nd Edition)
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12 pages, 5668 KiB  
Article
Twisted Bands with Degenerate Points of Photonic Hypercrystals in Infrared Region
by Yaoxian Zheng, Qiong Wang, Mi Lin, Luigi Bibbò and Zhengbiao Ouyang
Nanomaterials 2022, 12(12), 1985; https://doi.org/10.3390/nano12121985 - 9 Jun 2022
Cited by 2 | Viewed by 1853
Abstract
Photonic hypercrystals (PHCs) are materials combining hyperbolic metamaterials (HMMs) with widely used photonic crystals. We found that finite-sized Type-I HMMs can support unique electromagnetic modes, which could be utilized in two-dimensional photonic crystals to achieve PHCs with twisted bands in the infrared region. [...] Read more.
Photonic hypercrystals (PHCs) are materials combining hyperbolic metamaterials (HMMs) with widely used photonic crystals. We found that finite-sized Type-I HMMs can support unique electromagnetic modes, which could be utilized in two-dimensional photonic crystals to achieve PHCs with twisted bands in the infrared region. Numerical investigation of the PHCs showed that the twisted bands have degenerate points that can support all-angle self-collimation effects. The behaviors of light beams change dramatically in such bands, which provides an effective method in controlling light propagation and can be applied as switching. The effect of the filling factor and the permittivity of the dielectric medium of the HMM on the twisted bands were studied. Furthermore, by considering the nonlinear effect of the dielectric layers, an all-optical switch working on the PHC twisted bands is proposed, which has low switching power and high extinction ratio (19.75 dB), superior to conventional HMM switches that require type transformation of metamaterial. Full article
(This article belongs to the Special Issue Advance in Nanophotonics)
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17 pages, 5566 KiB  
Article
Spatial Dispersion in Hypercrystal Distributed Feedback Lasing
by Bartosz Janaszek and Paweł Szczepański
Materials 2022, 15(10), 3482; https://doi.org/10.3390/ma15103482 - 12 May 2022
Cited by 2 | Viewed by 1636
Abstract
This work is a first approach to investigate the role of spatial dispersion in photonic hypercrystals (PHCs). The scope of the presented analysis is focused on exploiting nonlocality, which can be controlled by appropriate design of the structure, to obtain new light generation [...] Read more.
This work is a first approach to investigate the role of spatial dispersion in photonic hypercrystals (PHCs). The scope of the presented analysis is focused on exploiting nonlocality, which can be controlled by appropriate design of the structure, to obtain new light generation effects in a distributed feedback (DFB) laser based on PHC, which are not observable under weak spatial dispersion. Here, we use effective medium approximation and our original model of threshold laser generation based on anisotropic transfer matrix method. To unequivocally identify nonlocal generation phenomena, the scope of our analysis includes comparison between local and nonlocal threshold generation spectra, which may be obtained for different geometries of PHC structure. In particular, we have presented that, in the presence of strong spatial dispersion, it is possible to obtain spectrally shifted Bragg wavelengths of TE- and TM-polarization spectra, lowered generation threshold levels for both light polarizations, generation of light of selected light polarization (TE or TM), or simultaneous generation of TE- and TM-polarized waves at different frequencies with controllable spectral separation, instead of single mode operation anticipated with local approach. Full article
(This article belongs to the Special Issue Trends in Electronic and Optoelectronic Materials)
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13 pages, 3651 KiB  
Article
Distributed Feedback Laser Based on Tunable Photonic Hypercrystal
by Bartosz Janaszek and Paweł Szczepański
Materials 2021, 14(15), 4065; https://doi.org/10.3390/ma14154065 - 21 Jul 2021
Cited by 16 | Viewed by 2123
Abstract
In this work, we investigate the generation of light in a distributed feedback (DFB) laser composed of periodically arranged layers of hyperbolic medium and active material forming a 1D photonic hypercrystal (PHC). The scope of our study covers the analysis of laser action [...] Read more.
In this work, we investigate the generation of light in a distributed feedback (DFB) laser composed of periodically arranged layers of hyperbolic medium and active material forming a 1D photonic hypercrystal (PHC). The scope of our study covers the analysis of laser action in the presence of different types of dispersion that are achievable in a hyperbolic medium. Using the example of a PHC structure consisting of graphene-based hyperbolic medium, we demonstrate the possibility of controlling laser action by tuning effective dispersion. Our analysis reveals the possibility of obtaining a single-frequency generation with high side-mode suppression and controllable wavelength of operation. Moreover, we present a new mechanism for the modulation of laser amplitude arising from voltage-controllable dispersion of hyperbolic medium. Full article
(This article belongs to the Special Issue Trends in Electronic and Optoelectronic Materials)
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